The SM-T211 is the 3G/Wi-Fi variant of the 7-inch tablet. It has a Marvell processor, which is different from the Intel chips found in some other Tab 3 models. This is —do not flash ROMs meant for the SM-T210 (Wi-Fi only) or the larger 8.0/10.1 models, or you will brick your device.
While development for this legacy hardware is limited, several community-led projects have provided stable or functional builds: LineageOS 18.1 (Android 11) custom rom for samsung galaxy tab 3 smt211 upd
(codenamed lt023g ), developers have focused on light, performance-oriented builds due to the device's aging hardware: The SM-T211 is the 3G/Wi-Fi variant of the 7-inch tablet
Modifications often include "zipaligning" and performance tweaks that result in faster read/write speeds for your external SD card. developers have focused on light